<template>
  <div>
    <div
      v-for="(item, index) in arr"
      style="display: inline-block"
      :key="index"
    >
      <input type="checkbox" :value="item" v-model="hobby" />
      <span>
        {{ item }}
      </span>
    </div>
    <p>你选中的元素，累加的值和为：{{ total }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      hobby: [],
    };
  },
  computed: {
    total: {
      get() {
        return this.hobby.reduce((obj, ind) => {
          return (obj += ind);
        }, 0);
      },
      set(val) {
        console.log(val);
      },
    },
  },
};
</script>

<style>
</style>